sale_crm_usability/sale_crm_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
   Copyright (C) 2016 Akretion (http://www.akretion.com/)
   @author: Alexis de Lattre <alexis.delattre@akretion.com>
   The licence is in the file __openerp__.py
-->

<openerp>
<data>

<record id="view_order_form" model="ir.ui.view">
    <field name="name">sale_crm_usability.sale.order.form</field>
    <field name="model">sale.order</field>
    <field name="inherit_id" ref="sale.view_order_form"/>
    <field name="arch" type="xml">
        <field name="pricelist_id" position="after">
            <field name="lead_id"
                domain="[('type', '=', 'opportunity'), ('partner_id', '=', partner_id)]"
                context="{'default_type': 'opportunity', 'default_partner_id': partner_id, 'default_user_id': uid, 'stage_type': 'opportunity', 'usability_default_stage_xmlid': 'crm.stage_lead4'}"/>
        </field>
    </field>
</record>

<record id="crm_case_form_view_oppor" model="ir.ui.view">
    <field name="name">sale_crm_usability.opportunity.form</field>
    <field name="model">crm.lead</field>
    <field name="inherit_id" ref="sale_crm.crm_case_form_view_oppor"/>
    <field name="priority">100</field>
    <!-- priority so that the button "View Quotations" is the last button -->
    <field name="arch" type="xml">
        <field name="stage_id" position="before">
            <button name="view_sale_orders" type="object" string="View Quotations"
                attrs="{'invisible': [('sale_ids', '=', False)]}"/>
        </field>
        <notebook position="inside">
            <page name="sale_orders" string="Sale Orders">
                <field name="sale_ids" nolabel="1"/>
            </page>
        </notebook>
    </field>
</record>


</data>
</openerp>